Question

Proteins that bind to cells and stimulate cell division are called

Answer 1

growth factors

Step-by-step explanation:

Answer 2

when G1/S cyclin-CDK is activated. Expression of G1/S cyclins is regulated by E2F proteins

Step-by-step explanation:

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Commitment to cell division occurs at Start when G1/S cyclin-CDK is activated. Expression of G1/S cyclins is regulated by E2F proteins in conjunction with pRB proteins.. Mitogens stimulated cell division by increasing the amount of G1 cyclins.